Mount Prospect, Illinois 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

842
FXUS63 KLOT 121717
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
Issued by National Weather Service St Louis MO
1217 PM CDT Fri Jun 12 2026

.KEY MESSAGES...

- Scattered thunderstorms, possibly severe Saturday afternoon
  into Saturday evening.

- Cooler temps early next week with precip chances midweek.

&&

.DISCUSSION...
Issued at 223 AM CDT Fri Jun 12 2026

Dry, cooler and breezy conditions are expected today with
westerly winds gusting into the 25 mph range from late morning
through sunset as highs top out in the lower 80s.

A cold front will move across the northern Plains and upper
midwest tonight and then move across the local area Saturday
night as low pressure lifts northeast from the southern Plains
tonight to central IL Saturday evening. This will allow for
scattered thunderstorms to develop, possibly during Saturday
afternoon and especially into Saturday evening. While the
highest potential for severe storms will be near the track of
the surface low, across KS and into south/central IL, still
enough uncertainty that trends will need to be monitored for
possible severe thunderstorms across the local area, especially
the southwest cwa. There are also some timing differences with
thunderstorms potentially lingering into early Sunday morning
across the southeast cwa. The cold front is expected to move
south of the area Sunday morning with dry and cooler temps again
Sunday as highs may only reach the lower/mid 70s.

Models show a weaker upper trough moving across the Great Lakes
region in the Tuesday time frame possibly bringing a chance of
showers and thunderstorms and then a strong upper trough moving
across the region Wednesday/Wednesday night along with a surface
cold front bringing a better chance for showers and
thunderstorms. Depending on timing and precip coverage, temps
could increase well into the 80s on Wednesday and then cooler
temps for Thursday. cms

&&

.AVIATION /18Z TAFS THROUGH 00Z SUNDAY/...
Issued at 1220 PM CDT Fri Jun 12 2026

Gusty west-southwest winds persist for all of north central
Illinois and northwest Indiana through sunset this evening.

Winds then weaken and become southwest overnight, at less than
10kts. Gusty southwest winds are then expected again for all
terminals tomorrow afternoon, with gusts as high as 20-25kts.
Mid-level clouds are also expected to increase through the
afternoon tomorrow.

Thunderstorm coverage is expected to increase across north
central Illinois late tomorrow evening, though this is expected
to remain off to the west of the Chicago terminals through 00Z
Sunday.

Brown - WFO LSX

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.

&&

$$

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